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依托某破碎花岗岩巷道工程,以多孔介质中气体的渗流理论为基础,综合考虑影响氡在破碎花岗岩山体及巷道中运移和析出的多种因素,构建了氡的数值计算模型,给出了山体和通风巷道中的氡浓度计算公式,模拟并比较了自然状态和微正压通风状态下山体中氡浓度分布的变化情况,并对微正压通风状态下巷道中氡浓度的变化情况进行模拟和验证。研究结果表明:扩散作用和渗流作用是巷道围岩中氡运移的主要机制;微正压通风条件下巷道中氡的运移主要受通风作用、围岩的射气作用和氡的衰变作用共同影响;微正压通风能够改变围岩中氡的渗流方向,是巷道降氡的有效手段。
Based on the seepage theory of gas in porous media and based on the seepage theory of gas in porous media, a numerical calculation model of radon is established based on a variety of factors that affect radon migration and deposition in the crushed granite and roadways. And the radon concentration in the ventilation tunnel, the variation of radon concentration distribution in the mountain under natural and micro-positive pressure ventilation was simulated and compared, and the variation of radon concentration in the tunnel under the positive pressure ventilation was simulated and verification. The results show that diffusion and seepage are the main mechanisms of radon migration in roadway surrounding rock. The radon migration in roadway under the condition of micro-positive pressure ventilation is mainly caused by the action of ventilation, the action of radioactivity of surrounding rock and the decay of radon Influence; Micro-positive pressure ventilation can change the direction of seepage of radon in the surrounding rock, is an effective means of reducing radon in roadway.